Putrid Goblin, First Day of Class, and Clickslither

Prerequisites

• Putrid Goblin on the battlefield
• First Day of Class in hand
• Clickslither on the battlefield
• available

Steps

1. Cast First Day of Class by paying Activate Clickslither by sacrificing Putrid Goblin When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Putrid Goblin enters, First Day of Class triggers, putting a +1/+1 counter on Putrid Goblin
3. Resolve the Clickslither ability
4. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinitely large creature until end of turn